- Bakeries, South Beloit
- Balloons - Novelty, Toy & Decorative, South Beloit
- Baptist Churches, South Beloit
- Barbers, South Beloit
- Bars, South Beloit
- Bars & Grills, South Beloit
- Beauty Salons, South Beloit
- Beer Taverns, South Beloit
- Bingo Halls, Supplies & Equipment, South Beloit
- Boat Services, South Beloit
- Boiler & Furnace Contractors, South Beloit - Installation, Cleaning & Repair Services
- Boiler Supplies & Equipment, South Beloit - Water Heaters & Boilers
- Bowling Centers, South Beloit
- Bowling Instruction, South Beloit
- Brake Service & Repair, South Beloit - Brake Pads
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- Brick Masonry & Bricklayer Contractors, South Beloit - Brick Mason - Install & Repair
- Bricks, Blocks & Stone Products, South Beloit - Companies, Wholesale, Manufacturers & Suppliers
- Builders & Contractors, South Beloit
- Builders & Contractors - More, South Beloit
- Builders Hardware Stores, South Beloit
- Building & Homes Manufactures, South Beloit
- Building Construction Consultants, South Beloit - Construction Management & Consulting
- Building Design & Construction Consultants, South Beloit
- Building Hardware & Materials, South Beloit
- Building Materials & Supplies, South Beloit
- Bus Lines, South Beloit - Bus Transportation
- Bus Lines Ticket Agencies, South Beloit
- Bus Rental & Charter Bus Service, South Beloit
- Business Legal Services, South Beloit
- Business Services, South Beloit
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